Garbage disposal causes a low-frequency humming noise through the worktop and cabinets even when operating normally.

Safety first: Turn off power before adjusting the installation.

• Check clearances: Ensure the Rangemaster disposal is not touching the cabinet walls, back panel, or rigid pipework. Adjust pipe runs or reposition the unit slightly if needed.
• Inspect isolation mounts: Confirm that all rubber gaskets and isolation rings supplied with the mounting kit are installed and not compressed flat.
• Loosen and re-seat: Slightly loosen the mounting ring, reposition the unit to centre it, then retighten evenly to avoid hard contact points.
• Add damping: If necessary, add rubber pads between mounting brackets and cabinet surfaces to reduce transmitted vibration.